MCQ Science Curiosity Chapter 4 Class 8 CBSE Board

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Electricity: Magnetic and Heating Effects

1. What can be used to detect if current is flowing in a circuit without an electric lamp?

Question 1 of 20

2. How can a temporary magnet be created?

Question 2 of 20

3. What causes heat generation in electrical appliances?

Question 3 of 20

4. How can you determine if a cell or battery is dead?

Question 4 of 20

5. Can all cells and batteries be recharged?

Question 5 of 20

6. What did Mohini and Aakarsh observe in Sumana’s lifting electromagnet model?

Question 6 of 20

7. What happens to the compass needle when current flows through a wire above it?

Question 7 of 20

8. What happens to the compass needle when the current in the wire is switched off?

Question 8 of 20

9. What is the region around a current-carrying wire where its magnetic effect can be felt called?

Question 9 of 20

10. Who discovered the link between electricity and magnetism in 1820?

Question 10 of 20

11. What is the phenomenon called when an electric current produces a magnetic field?

Question 11 of 20

12. What is a current-carrying coil with an iron core called?

Question 12 of 20

13. What materials are attracted by an electromagnet in Sumana’s model?

Question 13 of 20

14. What happens to an electromagnet when the electric current is stopped?

Question 14 of 20

15. In Activity 4.1, what is used to make a switch?

Question 15 of 20

16. What is the purpose of placing a magnetic compass beneath the wire in Activity 4.1?

Question 16 of 20

17. Why does the compass needle deflect in Activity 4.1 when the switch is turned ON?

Question 17 of 20

18. What is the effect of inserting an iron nail in the coil in Activity 4.3?

Question 18 of 20

19. What happens to iron paper clips placed near the ends of an electromagnet?

Question 19 of 20

20. How can the poles of an electromagnet be determined?

Question 20 of 20


 

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